The equation that its roots are ∣ 3 − 4 i ∣ a n d ( ω 2 + ω ) is ............
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i don't understand how α = ∣ 3 − 4 i ∣ = 5 ?
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∣ z ∣ is called the modulus or amplitude of complex number z . And it is given by: ∣ z ∣ = ∣ a + b i ∣ = a 2 + b 2 . Therefore, ∣ 3 − 4 i ∣ = 9 + 1 6 = 2 5 = 5 . You may refer to the practice section on Complex Number in Brilliant.com
i did forget what was meant by |3-4i| but omega^2+omega was -1 and thus i managed to find the roots of all equations!
Report the question as wrong as imaginary roots occur in pairs. omega ^2+omega was okay but can't believe i did not get |3-4i| till i solved and saw other procedures too!
Modulus of any complex number a + i b is defined as a 2 + b 2 . The question has no flaws.
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Let the two roots be α and β as follows:
α = ∣ 3 − 4 i ∣ = 5
β = ω 2 + ω and since ω 2 + ω + 1 = 0 ⇒ ω 2 + ω = β = − 1
By Vieta Formulas the equation must be:
x 2 − ( α + β ) x + ( α β ) = 0 ⇒ x 2 − 4 x − 5 = 0